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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ccfbcd138758755e7bbf2497632bcd31814d18e1a318b6bfa233ccd8850236' 
  AND token = 'WRakd4au1xwVN3bM/xbuzv6d4+ypjokg3Fkge9u1THI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}